Artificial tooth-crown.



PATBN'IED IAN. 20,1903.

E'. PIIIEDLANI). ARTIFICIAL Too'III CROWN.

ArPLIoATIoN FILED Anf Ie, Isoa';

H0 MODEL.

' ZAM Arnim* muon.

HERMANN FRIEDLAND, OF MAYENCE, GERMANY, ASSIGNOR TO THE FIRM OF H. FRIEDLAND da OIE.,

OF MAYENOE, GERMANY.

ARTIFICIAL TOOTI-IHCROWN.

SPECIFICATIOlTforming part of Letters Patent No. 718,614, dated January 20, 1903.

Serial No. 103,202. (No model.)

T a/ZZ whom t may concern:

Be it known that I, HERMANN FRIEDLAND, a subject of the Grand Duke of Hesse, residing at Mayence, in the Grand Dukedom of Hesse,

Empire of Germany, have invented a new and useful Artificial ToothOrown, of which the following is a specification.

My invention relates to improvements in artilicial tooth-crowns; and the object of my xo improvement are, first, to provide an all-porcelain dummy tooth-crown or both sides with two recesses, each recess reaching to a vertical plane near the front or face of the toothcrown, and, second, to provide this dummy i5 tooth-crown with one or several horizontal dowel-pins passing from the one recess to the other recess. The artificial tooth-crown so shaped or constructed affords special advantages. It can be used both with metal fittings zo and with vulcanite fittings. In the former case two metallic plates or strips are let into the recessess on both sides, while at the same time they are stuck on and soldered up with the dowel-pin or dowel-pins, so as to afford a z 5 large soldering-surface. Then the teeth are connected by soldering together the adjacent lateral plates or strips of adjacent toothcrowns. In the other case when vulcanite ttings are used the projecting ends of the 3o dowel-pin or dowel-pins, which may be either left straight or bent somewhat like a hook, are embedded in the plastic mass iilling up the recesses. In all cases a much firmer hold of the tooth-crown in its center is obtained than hitherto by the usual rear attachments. Moreover, the new tooth-crown presents two further essential advantages-viz., that the metal or vulcanite ittings do not appear on the face or front and that no screwed pin and 4o nut are required, such as were hitherto used for securing a tooth-crown on a tooth root or stump and which are liable to get chipped off.

5o Instead of the single pin c shown in the drawings several such pins may also be provided, which can be burned in during the manufacture or only subsequently fastened to the tooth in any desired manner.

The lateral recesses (indicated by a on the drawings) serve in the case of metal fittings for receiving soldering-strips b, while for vulcanite fittings they are filled in with the plastic material. With metal iittings the soldering-strips b are fully embedded in the tooth, 6o so as in no way to project. They are attached to the same by means of a pin c or pins in case several such pins are employed, the plates being stuck on the said pins and soldered together. In this manner the lateral soldering-strips b have an immovably firm hold in the tooth, While they are prevented from turning by the long vertical planes d e, placed at a short distance from the pin c. In vulcanite ittings thelaterally projecting 7o ends of the pins can be either left straight or curved or bent in any suitable manner into a hook shape. In the subsequent filling up of the lateral recesses a of the teeth with the plastic mass a much iirmer hold is attained by means of laterally-projecting pin ends c than is the case with the usual rear-hook-attachment pins.

By means of this improved tooth construction the biting 0E or chipping 0E of the teeth 8o during mastication, which so frequently takes place with the usual rear-attachment devices, is'entirelyavoided. Looseness andpremature breaking away of the teeth from the Vulcanite plate can also no longer arise. With metal 8 5 fittings a lateral soldering can be edected which avoids the necessity of any interstices between the separate teeth of a row, whereby the teeth are enabled to hold better in consequence of the larger lateral holding-sur- 9o faces. The lateral soldering also permits of the omission of base-plates in the production of entire sets of teeth or in bridgework; but even for sets of teeth with base-plates teeth having the improved lateral soldering or attachment afford a better hold than teeth with the usual soldering upon the rear orinner face.

Having now particularly described and ascertained the nature of my said invention and roo in what manner the same is to be performed, l vided with one or several horizontal dowel- I declare that what I claim, and desire to sepins passing from the one recess to the other cu re by Letters Patent, isrecess,in combination with two metallic strips l. An al1-porcelain dummy tooth-crown let into said recesses and soldered t'o said having on both sides two recesses reaching to dowel-pins for affording each a large soldervertical planes near the front or face and proing-surface.

vided with one or several horizontal dowel- In witness whereof I have hereunto set my pins passing from the one recess to the other hand in presence of two witnesses.

recess. HERMANN FRIEDLAND. LL. 8.]

2. An al1-porcelain dummy to0th-crown Witnesses:

having on both sides two recesses reaching to EMIL HANAN,

vertical planes near the front or face and pro- WALTER HOUSING. 

